The invention discloses a method for eliminating ambiguity of a wireless fingerprint map, which relates to the technical field of positioning services and comprises the following steps: S1, determining the lowest sampling period of a mobile terminal, and acquiring inertial sensor data and RSSI data of the mobile terminal; S2, converting the inertial sensor data into a logic track and an end pointset of the logic track through particle filtering; S3, dividing the end point set into A, B and C classes according to the weight, and correspondingly forming A, B and C class track clusters; S4, forming queues by the obtained A, B and C class track clusters; S5, eliminating fingerprint ambiguity. The indoor wireless fingerprint map generating method has the advantages that trajectory ambiguity iseliminated through trajectory joint constraint, the trajectory utilization rate is increased, a large number of short trajectories are utilized, the use efficiency of data is improved in the mode ofincreasing the trajectory utilization rate, and the defect of the total data amount caused by low-frequency sampling is overcome.